```html
<!-- MyComponent.stories.svelte -->

<script>
  import { Meta, Template, Story } from '@storybook/addon-svelte-csf';

  import MyComponent from './MyComponent.svelte';
</script>

<Meta
  title="A story using environment variables inside a .env file"
  component={MyComponent}
/>

<Template let:args>
  <MyComponent {...args} />
</Template>

<Story
  name="Default"
  args={{
    propertyA: process.env.STORYBOOK_DATA_KEY,
  }}
/>
```